代码如下:if (!function_exists('gzdecode')) {          function gzdecode ($data) {              $flags = ord(substr($data, 3, 1));              $headerlen = 10;              $extralen = 0;              $filenamelen = 0;              if ($flags & 4) {                  $extralen = unpack('v' ,substr($data, 10, 2));                  $extralen = $extralen[1];                  $headerlen += 2 + $extralen;              }              if ($flags & 8) // Filename                  $headerlen = strpos($data, chr(0), $headerlen) + 1;              if ($flags & 16) // Comment                  $headerlen = strpos($data, chr(0), $headerlen) + 1;              if ($flags & 2) // CRC at end of file                  $headerlen += 2;              $unpacked = @gzinflate(substr($data, $headerlen));              if ($unpacked === FALSE)                    $unpacked = $data;              return $unpacked;           }      } 调用简单：  $f=@file_get_contents("http://www.jb51.net");       echo gzdecode($f);